Fluid and Lithology Prediction Utilizing Quantitative Well logging and Seismic Data Interpretation, West Delta Deep Marine Concession, Egypt.

Abstract

This study is focused on the Sienna Field. It is a gas field in the southern portion of the West Delta Deep Marine (WDDM) concession, approximately 120 km Northeast of Alexandria, Egypt. The main purpose of this study is how to discriminate between fluid and lithology by using well logging data with different seismic interpretation methods as AVO modeling, Extended Elastic Impedance and Artificial Neural Network. This work is represented in seven chapters: Chapter One discussed the location of the study area, objectives of the present study, available data for the study, methodology and exploration history of Sienna field. Chapter Two debated the geologic setting of the West Delta Deep Marine (WDDM), including detailed discussion of subsurface stratigraphy and the regional stratigraphic column of (WDDM), structural settings and tectonic framework of (WDDM), where the study area is located, especially Sienna Field. It is based on previously published literatures and the available subsurface geological data. Chapter Three Figured out the well logging analysis and formation evaluation of the productive zones to determine the petrophysical properties and the reservoirs characteristics for the Sienna channel rocks. The well log data analysis has been carried out using Tech Log® Schlmberger Software. In this study, the petrophysical characterizations of the subsurface sandstone Plio-Pleistocene reservoir in the offshore Nile Delta Sienna field has been defined based on the well log data available in three wells. The detailed petrophysical analysis revealed the presence of a gas-bearing sandstone interval ranged from 1 to 12 m of net pay zone with good reservoir